Fork Service/Rebuild

discussion about the 750 Sport and '89/'90 900SS, which share many mechanicals with the Paso series
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Fireypete
Posts: 36
Joined: Sat Aug 23, 2025 5:24 am
model: 750 Sport
year: 1990
Location: Australia

Fork Service/Rebuild

Post by Fireypete »

Geez I'm posting a bit here :P

So with the wheels on I gave the front a push. Suspension went down and came back up but without much enthusiasm. No leaks/marks on the forks, just doesnt feel great. Maybe with me on boaerd riding it may feel better but the bike is a while away before it hits the road.
Wondering if anyone has drained the fork oil throught the drain screw and put in new springs and fresh fluid whilst forks are on the bike.
Put it on a front stand, drain oil, push the forks down and put oil in, lift, drop in springs forks cap on and.... sounds easy...too easy...
Hyperpro make a kit which isnt too expensive, postage is not too bad Dunno if there are many options here in OZ.
Mc tool
paso grand pooh-bah
Posts: 1984
Joined: Wed Dec 05, 2007 12:35 am
model: 906 Paso
year: 1990
Location: Riverton New Zealand

Re: Fork Service/Rebuild

Post by Mc tool »

One thing , Make damn sure the bike cant fall off whatever you are using to hold it up . I have seen more than once where when the weight comes off the front suspension, bike front end drops and the whole plot rolls forward off the stand and falls over , and if its on a bench/table its a long way to the floor . Oh my Guzzi was fine because it landed on Dianne's bike ............she was far from fine :D :lol:
I wish I was young again............Id be heaps smarter than last time
Kiwi Rider
Posts: 50
Joined: Thu Sep 05, 2024 6:47 am
model: 750 Sport
year: 1988
Location: Southland, New Zealand

Re: Fork Service/Rebuild

Post by Kiwi Rider »

Just my 10 cents but for what its worth I would take those forks out and pull em apart as that oil will be well old and you wont be able to clean them properly in place. Also a chance to replace the fork seals as they will be old too and being made of rubber... not an expensive part.
That's what I did with mine anyhoo. A stand that locates inside the bottom of the steering stem is essential for this job.
Fireypete
Posts: 36
Joined: Sat Aug 23, 2025 5:24 am
model: 750 Sport
year: 1990
Location: Australia

Re: Fork Service/Rebuild

Post by Fireypete »

There is a lot of 40mm seals out there. Is it anything for a 40mm marzocchi fork? The genuine part number doesnt seem to generate a set.
Mc tool
paso grand pooh-bah
Posts: 1984
Joined: Wed Dec 05, 2007 12:35 am
model: 906 Paso
year: 1990
Location: Riverton New Zealand

Re: Fork Service/Rebuild

Post by Mc tool »

There are heaps on ebay ..... ,just search 40mm marzocchi fork seal
I wish I was young again............Id be heaps smarter than last time
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